Container for filter-presses.



PATBNTED FEB. 20, 1906.

C. W. MERRILL. CONTAINER FOR FILTER PRESSES.

APPLICATION FILED MAY 3. 1905.

2 SHEETS-SHEET 1.

l. INVENTORZ WITNESSES:

By his Atzomey PATENTED FEB. 20, 1906.

0. W. MERRILL. CONTAINER FOR FILTER PRESSES.

- 2 sH'BETs-sHBBT 2.

APPLICATION FILED MAY 3, 1905.

WITNESSES: INVENTOR g W4 fiMZM nnrrnn STATES rarnwr enrich CHARLES W. MERRILL, "OF 11%, SOUTH lDAKQTA. tCQN TAlNER FDR FlLTER PRlESSESB Specification of Letters Patent.

Patented Feb. 20, 1906.

Application filed Maya, 1905. Serial No. 258,650

To all whom it may concern.-

Be it known that 1, CHARLES W. MERRILL,

a citizen of the United States, and a resident of Lead, county of Lawrence, State of South Dakota, have invented a new and useful Improvement in Containers for Filter-Presses,

of which thefollowing is a specification.

My invention relates to improvements in the containers of pressure-filters and the object of the'same is to facilitate the removal of gases or liquids from the interstitial s aces of the solid or semisolid contents of sai containers.

in the operation of filter-presses or similar pressure-filters and the treatment of the contents thereof it. is frequently advisable to remove the liquid or gas from the interstitial spaces of the solid or semisolid contents of the containers. Containers which have heretofore been used in the ordinary forms of filter-presses have generally been constructed with unbroken or continuous inside surfaces, which are parallel to the main or lon itudi nal axis of the filter-press. in all 8110?]. containers the attempt to remove or replace theliquid or gas from the interstitial spaces of the solid or semisolid contentsby the application of any gas or liquid under pressure results in the so called replacing gas or liquid following the unbroken or continuous inner surfaceoi the containers, because such continuous surfaces ofier to it the lines of least resistance. As a result thereof the removal or replacement of the liquid or gas is imperfeet, even when the solid or semisolid contents are in contact with the whole of the-inner surface of the container, and an undesirable mining of the contained gas or liquid with the replacing gas or liquid results. Moreover, it frequently happens that after filling the containers with solid or semisolid material a certain amount of settling occurs, particularly when containers of large dimensions are used. As a result there is a losso'f contact between the solid or semisolid material and the inner surface of the container, as a result of which the replacing gas or liquid passes through the space so formed instead of through the solid contents itself. To obviate this difiiculty containers have been provided with ribs or corrugations on their inner surfaces, as shown in the form described in the United States atent issued to Montgomerie, No. 620,716, ated March 7, 1899; but with containers so formed a shrinkage of the cake ways desirable.

results in an openspace, as Shown in Fig. 4. A further difficulty presents itself, as thesifect of any shrinkage of the cake of precl 1- tatedmassin the container which genera ly.

occurs is to leave a channel or space of least resistance through which the liquid or gas.

used in treating the material will pass, for the reason that the shrinka e will separate the cake from the inner su 'ace of the container and leave an open channel through which the air or gas when used in the operation conducted in the filter press Wlll rush instead of slowly permeating the cake and forcing the water outahead of it, which is al- Where, however, a rib is made of the inverted-keystone form shown in the drawings, the cake will form solidly.

around it, and as the large end of the key stone projects into the container the effect will be to prevent the cake from shrinking away from the inner surface of the container or rib, and in this way to form a tight joint between the wedge-shaped rib and the cake.

The inventionwill be best understood by reference to the accompanying sheet of draw- Figure l is a vertical section of a container oi a filtering-press of the usual form 'on the line Q of Fig. 2. Fig. 2 is a vertical crosssection oi a series of containers put together,

taken on the line P P of Fig. 7.. Fig. 3 is a detail view, on an enlarged scale, of the inner face of the container. Fig. 4 shows the way in which the shrinkage of ca re takes place in the ordinary ribbed form of container; Fig. 5, the way in. which it takes place in the present of. container. container, showing a single rib used in connection. with two ribs at certain points; and

Fig. 7 is a similar view showing two ribs used 9 in. the center of the container and three ribs at top and bottom.

Similar characters refer to similar parts throughout the several views.

in the drawings, :10 represents the walls of the container.

i) represents a wedge or keystone shaped rib formed, preferably, in the center of the container, as shown in Fi s. 2 and 3-.

g represents the filter-p atesl o is an opening or outlet through which the solid, semisolid,.or unfilterable material, called for convenience ,the precipitate, is removed from the containers and which when a series of containers is put together in a filter- Fig. 6 is a sectional view of a for the purposes of describing the operative press makes a continuous opening throughthe press, which is closed at the end in any convenient manner and discharges into a suitable receptacle. a is a corresponding inlet for treating the precipitate in place with liquids, vapors, or gases, which is prefer ably placed at either or all of the corners of the container and in like manner forms a continuous opening or openings when the containers are placed to ether in the filter press. d isan inlet throng which the material to be filtered is introduced, which inlet is of the same eneral characterand becomes continuous w en the containers are put.together in a filter-press and is provided with the openings 9 9 9, throughwhich the material is introduced intothe chambers. Outlets 8 Sam provided for the efliuent liquids, vapors, or gases from the filter-plates, which form no part of the present invention, but is shown here merely container.

In. the drawings a single rib is shown only on the inner surface of the container ;'but two or more may be-used, if desired, according to the size of the container or the character of the cake, orone'rnay be used along a portlon of the inner surface and two or more alon the remainder of the surface, the number an grouping ofithe. ribs varying from time to time as may be found expedient. The mater-i l tov be filteredenters the press through the channels (1, which may be located .in any point of the inner 'eriphery of rovided for each plate or through the outets 8 into any suitable receptacle.

I claim as my invention- 1. In a filter-press, a container provided with a wedge-shaped element along its inner surface. s p 2. In a filter-press, a container having an inner surface in the form of a ke stone, with the large end extending outwar into the interior substantially as described.

3. In a filter-press, a container provided with a keystone-rib :along the entire inner surface of said container.

i. In 'a;filter-press, .a container. provided with a seriesiof ke stone-sha' ed ribs along the entire inner surface of sai container.

5,. In afilter press, a container provided with a keystone-shaped. rib along a portion of the inner surface-of said container.

6. In a filter-press, a container provided with a series of keystone-shaped ribs, along a portion of the .inner surface 'of said container.

7. In a filter-press, a container provided with a series of keystoneshaped ribs along a portion of the inner surface, and a single kegstone-shaped rib along the remainder of t e inner s ace.

8. In a filter-press, a container provided with a certain number of keystone-shaped ribs-along a portion of the inner surface, and a varying number of similar ribs along the remainder of the inner surface.

In testimony that I claim the foregoing as my invention I have signed my name in presenceof two witnesses.

CHARLES WsME RRILL. Witnesses -WM. FRACKELTON', G. D. FoeLnsoNe. 

